#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	float r = 0;
	float d = 0;
	float c = 0;
	float s = 0;
	float a = 3.14159;

	scanf("%f", &r);
	d = 2 * r;
	c = d * a;
	s = r *r * a;
	printf("%.4f %.4f %.4f", d, c, s);
	return 0;
}